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L-shaped stairs with a landing or winders

Generate quarter-turn stairs: two straight flights joined by a square landing or by three winder treads cut at 30 degree steps from the inner corner, turning left or right, with an optional support block. Use it where a stair must turn a corner.

Recorded render of L-shaped stairs with a landing or winders

What this component contains

  • ATTRIBUTION.md
  • LICENSE
  • README.md
  • component.json
  • graphcheck.py
  • meshcheck.py
  • preview.png
  • stairs_l_shaped.py
  • test_package.py
  • test_stairs_l_shaped.py
  • verification/native.json

How it works

Operator
baltor.stairs_l_shaped
Parameters
first_steps, second_steps, corner, turn, rise, going, width, tread_thickness and 1 more
Result
One mesh object named L-Shaped Stairs made of closed treads.
Blender
4.2 or later
Axes
Blender Z up, -Y forward
Units
metres

Recorded checks

blender 5.2.1 LTS (hash 9e2066aef7ef built 2026-08-25 02:12:34)

  • addon_install_and_enable
  • operator_runs_with_defaults
  • blender_data_matches_core
  • addon_disable_unregisters
  • script_mode_runs
  • clean_reopen_addon_file
  • clean_reopen_script_file
  • gltf_separate_export
  • engine_output_clean

Limits to consider

Winders radiate from the inner corner, so their inner ends are very narrow; real stairs often offset the pivot to keep a minimum inner tread, which this generator does not do. No stringers, risers or handrail. Parts are separate closed solids in one mesh. Verified in Blender 5.2.1; written for the 4.2 API.